<template>
  <li :style="{background: bgColor}"  @mouseenter="handleEnter(true)" @mouseleave="handleEnter(false)">
    <label>
      <input type="checkbox" v-model="todo.complete"/>
      <span>{{todo.title}}</span>
    </label>
    <button class="btn btn-danger" v-show="isShow" @click="deleteItem">删除</button>
  </li>
</template>

<script>
    export default {
        //接收父页面传递过来的值
      props:{
        todo:Object,
        deleteTodo: Function,
        index:Number
      },
      data () {
        return {
          //设置默认的背景色和按钮不显示
          bgColor: 'white',
          isShow: false
        }
      },
      methods: {
        handleEnter (isEnter) {
          if(isEnter) { // 进入
            this.bgColor = '#cccccc'
            this.isShow = true
          } else { // 离开
            this.bgColor = '#ffffff'
            this.isShow = false
          }

        },

        deleteItem () {
          this.deleteTodo(this.index)
        }
      }

    }
</script>

<style>
  li {
    list-style: none;
    height: 36px;
    line-height: 36px;
    padding: 0 5px;
    border-bottom: 1px solid #ddd;
  }

  li label {
    float: left;
    cursor: pointer;
  }

  li label li input {
    vertical-align: middle;
    margin-right: 6px;
    position: relative;
    top: -1px;
  }

  li button {
    float: right;
    display: none;
    margin-top: 3px;
  }

  li:before {
    content: initial;
  }

  li:last-child {
    border-bottom: none;
  }
</style>

